A New Multiple Description Layered Coding Method Over Ad-hoc Network (WP-P2)

Author(s) : Song Xiao (ISN National Key Lab., Xidian University, China) Chengke Wu (ISN National key lab., Xidian University, China) Fang Zhang (ISN National Key lab., Xidian University, China)

Abstract : A new combined multiple description and layered coding method based on adaptive frame insertion (AFI-MDLC) for transmission of video bit stream over wireless ad-hoc network is proposed in this paper. The main idea of the method is to adaptively insert the transition frames according to the relative motion between two neighboring frames, and then divide the video sequence into two descriptions with independent prediction loops. Afterwards, the base layer and the enhancement layer bit stream for each description are generated and transmitted across wireless network, which is modeled with finite state Markov process. A multiple-path transmitting strategy is presented for the AFI-MDLC data packets according to the characteristics of ad hoc multi-hop wireless network. The experimental results show that the method can help the decoder more quickly recovered from packet loss compared with previous method, and provides more stable and better quality for the reconstruction of video sequence.

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